ZXLD1362ET5TA Diodes Inc, ZXLD1362ET5TA Datasheet - Page 25

• Manufacturer Part Number: ZXLD1362ET5TA
• Description: LED Drivers 1A/60V LED DRIVER
• Manufacturer: Diodes Inc

Specifications of ZXLD1362ET5TA

• Operating Supply Voltage: 6 V to 60 V
• Maximum Power Dissipation: 1000 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: TSOT-23
• Minimum Operating Temperature: - 40 C
• Led Driver Application: Automotive Lighting, Illuminated Signs
• Topology: Buck (Step Down)
• No. Of Outputs: 1
• Output Current: 1A
• Input Voltage: 6V To 60V
• Dimming Control Type: PWM / DC
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

A Product Line of
Diodes Incorporated
ZXLD1362
Application Information
(cont.)
Layout Considerations
LX pin
The LX pin of the device is a fast switching node, so PCB tracks should be kept as short as possible. To minimize ground
'bounce', the ground pin of the device should be soldered directly to the ground plane.
Coil and decoupling capacitors and current sense resistor
It is particularly important to mount the coil and the input decoupling capacitor as close to the device pins as possible to
minimize parasitic resistance and inductance, which will degrade efficiency. It is also important to minimize any track
resistance in series with current sense resistor R
. Its best to connect V
directly to one end of R
and I
directly to the
S
IN
S
SENSE
opposite end of R
with no other currents flowing in these tracks. It is important that the cathode current of the Schottky
S
diode does not flow in a track between R
and V
as this may give an apparent higher measure of current than is actual
S
IN
because of track resistance.
ADJ pin
The ADJ pin is a high impedance input for voltages up to 1.35V so, when left floating, PCB tracks to this pin should be as
short as possible to reduce noise pickup. A 100nF capacitor from the ADJ pin to ground will reduce frequency modulation of
the output under these conditions. An additional series 3.3kΩ resistor can also be used when driving the ADJ pin from an
external circuit (see below). This resistor will provide filtering for low frequency noise and provide protection against high
voltage transients.
3.3k
ZXLD1362
ADJ
GND
100nF
GND
High voltage tracks
Avoid running any high voltage tracks close to the ADJ pin, to reduce the risk of leakage currents due to board
contamination. The ADJ pin is soft-clamped for voltages above 1.35V to desensitize it to leakage that might raise the ADJ
pin voltage and cause excessive output current. However, a ground ring placed around the ADJ pin is recommended to
minimize changes in output current under these conditions.
Evaluation PCB
ZXLD1362 evaluation boards are available on request and provide quick testing of the ZXLD1362 device.
25 of 28
ZXLD1362
March 2011
www.diodes.com
© Diodes Incorporated
Document number: DS33472 Rev. 3 - 2